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Superior olivary complex organization and cytoarchitecture may be correlated with function and catarrhine primate phylogeny.

Hilbig H, Beil B, Hilbig H, Call J, Bidmon HJ - Brain Struct Funct (2009)

Bottom Line: As recency of common ancestry with human beings increases, primates have improved low-frequency sensitivity and reduced sensitivity to higher frequencies.Here, Nissl-stained sections of the superior olivary complex of man (Homo sapiens), bonobo (Pan paniscus), chimpanzee (Pan troglodytes), gorilla (Gorilla gorilla), orangutan (Pongo pygmaeus), gibbon (Hylobates lar), and macaque (Macaca fascicularis) were compared to reveal differences and coincidences.From chimpanzees to humans, the size of the LSO decreased, and the MNTB as a compact nucleus nearly disappears.

View Article: PubMed Central - PubMed

Affiliation: Institute of Anatomy, Leipzig University, Liebigstr. 13, 04103, Leipzig, Germany. hilbigh@medizin.uni-leipzig.de

ABSTRACT
In the mammalian auditory system, the medial nucleus of the trapezoid body and the lateral superior olive (MNTB-LSO system) contribute to binaural intensity processing and lateralization. Localization precision varies with the sound frequencies. As recency of common ancestry with human beings increases, primates have improved low-frequency sensitivity and reduced sensitivity to higher frequencies. The medial part of the MNTB is devoted to higher frequency processing. Thus, its high-frequency-dependent function is nearly lost in humans and its role in binaural processing as part of the contralateral pathway to the LSO remains questionable. Here, Nissl-stained sections of the superior olivary complex of man (Homo sapiens), bonobo (Pan paniscus), chimpanzee (Pan troglodytes), gorilla (Gorilla gorilla), orangutan (Pongo pygmaeus), gibbon (Hylobates lar), and macaque (Macaca fascicularis) were compared to reveal differences and coincidences. From chimpanzees to humans, the size of the LSO decreased, and the MNTB as a compact nucleus nearly disappears. From chimpanzees to humans, the LSO/MNTB ratio increases dramatically too, whereas the LSO/MSO ratio remains 1.1; a finding that probably corresponds to the phylogenetic proximity between the species.

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Related in: MedlinePlus

Examples of single section overlays for 3-D reconstruction. Grey MNTB, black MSO (somata), dotted line total MSO, white LSO
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Fig2: Examples of single section overlays for 3-D reconstruction. Grey MNTB, black MSO (somata), dotted line total MSO, white LSO

Mentions: The dendritic trees of the neurons in the MSO, as revealed in Silver-Nissl impregnated sections, were additionally labeled by fine dotted lines (and by open circles in Fig. 2) for the vectorization.Fig. 2


Superior olivary complex organization and cytoarchitecture may be correlated with function and catarrhine primate phylogeny.

Hilbig H, Beil B, Hilbig H, Call J, Bidmon HJ - Brain Struct Funct (2009)

Examples of single section overlays for 3-D reconstruction. Grey MNTB, black MSO (somata), dotted line total MSO, white LSO
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2737112&req=5

Fig2: Examples of single section overlays for 3-D reconstruction. Grey MNTB, black MSO (somata), dotted line total MSO, white LSO
Mentions: The dendritic trees of the neurons in the MSO, as revealed in Silver-Nissl impregnated sections, were additionally labeled by fine dotted lines (and by open circles in Fig. 2) for the vectorization.Fig. 2

Bottom Line: As recency of common ancestry with human beings increases, primates have improved low-frequency sensitivity and reduced sensitivity to higher frequencies.Here, Nissl-stained sections of the superior olivary complex of man (Homo sapiens), bonobo (Pan paniscus), chimpanzee (Pan troglodytes), gorilla (Gorilla gorilla), orangutan (Pongo pygmaeus), gibbon (Hylobates lar), and macaque (Macaca fascicularis) were compared to reveal differences and coincidences.From chimpanzees to humans, the size of the LSO decreased, and the MNTB as a compact nucleus nearly disappears.

View Article: PubMed Central - PubMed

Affiliation: Institute of Anatomy, Leipzig University, Liebigstr. 13, 04103, Leipzig, Germany. hilbigh@medizin.uni-leipzig.de

ABSTRACT
In the mammalian auditory system, the medial nucleus of the trapezoid body and the lateral superior olive (MNTB-LSO system) contribute to binaural intensity processing and lateralization. Localization precision varies with the sound frequencies. As recency of common ancestry with human beings increases, primates have improved low-frequency sensitivity and reduced sensitivity to higher frequencies. The medial part of the MNTB is devoted to higher frequency processing. Thus, its high-frequency-dependent function is nearly lost in humans and its role in binaural processing as part of the contralateral pathway to the LSO remains questionable. Here, Nissl-stained sections of the superior olivary complex of man (Homo sapiens), bonobo (Pan paniscus), chimpanzee (Pan troglodytes), gorilla (Gorilla gorilla), orangutan (Pongo pygmaeus), gibbon (Hylobates lar), and macaque (Macaca fascicularis) were compared to reveal differences and coincidences. From chimpanzees to humans, the size of the LSO decreased, and the MNTB as a compact nucleus nearly disappears. From chimpanzees to humans, the LSO/MNTB ratio increases dramatically too, whereas the LSO/MSO ratio remains 1.1; a finding that probably corresponds to the phylogenetic proximity between the species.

Show MeSH
Related in: MedlinePlus